Jig for braces and bits.



M. F. ROBERTS. JIG FOR BRAC/ES AND BITS. APPLICATION FILED DBO. 14.1907.

Patented Apr. 6, 1909.

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hung MORRIS F. ROBERTS, OF PHILADELPHIA, PENNSYLVANIA.

11G .FOR BRLGES AND BITS.

Application filed December 14, 1907.

To all whom it may concern.'

Be it known that l, Monni's F. lonnn'rs, a citizen oi' the United States, residing in the city and county ot Philadelphia, State oi' Pennsylvania, have invented a new and useful Jig for Braces and Bits, ci which the ich lowing is a speciiication.

My invention relates to new and uselul ljigs for braces and bits and consists oi means for adjusting and locking a guide in adjusted position, whereby accuracy and speed. is ci tained.

It 'further consists in providing an expansible split guide for the bit or tool.

it further consists in locating the guide at a point adjacent the work, whereby the bit or tool is positively directed.

it further consists of an adjustable stop for limiting the forward movement oi' the tool or bit.

It further consists of other novel details oi' construction, all as will be hereinafter iully set forth.

Figure 1 represents a side elevation oil a jig i'or wood Workers embodying my invention showing the tool or bit in position. Fig. 2 represents a section al. View thereoi. Fig. 3

represents a rear elevation oi the device. Fig. 4 represents a plan view lookingupward. Fig. 5 represents a sectional view on line fc-r, Fig. 1. Fig. 6 represents an elevation of a portion oi' the device. TJig. 7 is a perspective o1 a guide member.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings 1 have found in practice that it is essential in boring Afor dowels and the like that some means be provided lor properly directing the tool to the Work and further that the guide ol the tool be adjustable and held in adjusted position in order to insure accuracy in the work and l have further found that it is necessary to provide some torni of guide which will accommodate various sized bits or tools.

ln the drawings, l have shown a construction for carrying out my invention, but it will be evident that arrangement of the parts may be varied and other instrumentalities may be employed which will corne within the scope oll my invention and I do not, therefore, desire to be limited to the enact form herein shown and described but desire to make such changes as may be necessary.

1 designates the traine of the jig having the lug 2 thereon through which passes the Specification o' Letters Patent.

Patented. april 6, 1909.

Serial No. 406,439.

threaded rod 3 carrying the Washer 4 and having the operating nut or head 5 thereon, it being understood that said scr w is nioved in the lug 2 by rotating the same.

6 designates a lug extending troni the traine 1 and between which and the v-:asher 4 the article to be bored or otherwise opera ated upon is adapted to be secured, this being shown in dotted lines in Figs. l and 2.

7 and 8 designate tracks or guides which project from the traine 1 preferably in the opposite direction from the lug 2 and plate 6 and one of said tracks, as for example 8, being provided with a slot 9. lnteriitting the tracks is the adjusting block 1G, the saine being provided upon the one tace with the iii-shaped recess 11 and having a slot extending through said block and the slot 13 extending part Way down one side of said block. For locking the block in position l provide a screw 14 movable in said slot 9 and engaging said block and being adapted to be tightened to lock the said block 10 in its adjusted positions, this being accomplished by properly rotating the said screwT 14 and causing a washer 15 or other suitable device to engage with the outer side of the track 8. Adapted to be seated in the `t-shaped recess 11 in the block is an eXpansible guide 16, Which in the present instance consists of a split tube and which is adapted to receive the bit 17X or tool for guiding the same. It will be noted that this tube is ot a suitable material so that when different sized drills are used, the split tube will expand to receive the same and act as a guide for setting and maintaining the tool in correct alinement. rifhe said guide 16 is suitably held in position by any desired means. in the present oase, 1 have shown a hook 17, one end of which as 18 Fig. 3 being seated in the slot 13, and said hook being also provided with a threaded end 19 seated in the slot 12, the hook passing around and engaging the eXpansible split guide after the saine has been placed in position. The hook is locked in position by means ol a thumb nut 20 which engages with the threaded end 19 ci the hook 17 and abuts the block, whereby the said hook 'will be held iirmiy in position, the movement thereof in side direction being prevented by being seated. in the slots 12 and 13. The hook 17 is adapted to accommodate various sized guides by simply loosening the thumb nut 20 and raising the hook, removing one guide and substituting Vjusted, on the another guide, after which the nut is again rotated to lock the parts. The hook is preferably made with the V-bend 21, so that the guides are firmly held between the V-seat 21 and the V-seat 11, this construction being more clearly seen in Fig. 3.

l provide a suitable stop for the bit or tool 17 X, the same being adapted to be 'lirmly connected with the said bit at the desired point, said stop consisting in the present instance, of the frame 22 having a V-shaped.

recess 23 and the slot or cut away portion 24 in one side which is adapted to receive the threaded end 25 of a hook 26 similar to that already described, said hook having the thumb nut 27 thereon, which is adapted to abut the lower portion of the body 22 when the tool 17 is in position between the V- shaped recess 23 and the hook, the latter being also provided with the bend or V 23 similar to that described with respect to the hook 17.

The operation of the device will be readily seen: The article to be bored or otherwise operated upon, is seated between the lug 6 and the washer 4, and by proper manipulation of the rod 3 the article is hrmly gripped between the parts, thus locking the body in position. The osition of the block 10 is adody, by loosening the screw 14 and raising or lowering the block 10 between the tracks 7 and 8 until the desired ortion is reached, when said block 10 is ocked. The split guide 16 has been placed in position with respect to the V recesses 11 and 21, said guide 16 receiving the tool 17X, it being a suitable size therefor,the thumb nut 20 having been tightened in order to secure the hook 17 vfirmly, with respect to the block 10 and thus locking the guide 16 in position. The stop is positioned or placed upon the tool 17X at the point where it is desired that the work thereof should cease by placing the tool or bit between the hook 2 6 and the V recess 23 in said stop, and by tightening u the thumb nut 27 so that the said stop is -rmly held in position on the bit. By proper operation of the bit or tool, it will be seen that the holes are bored in thc material, the work ceasing as soon as the stop contacts with the guide 16, reventing Jfurther entrance of the tool. y this means work can be quickly and easily accomplished and the adjustment of the parts is an easy matter also. At a suitable oint on the frame, as at 29, Fig. 6 1 provi e a suitable marker or indicator which is so arranged with respect to the jig and the guide 16 itself, that it will always mark or indicate the location of the exact center of the guide tube and the tool or bit therein, so that as it is, in ractice, impossible to bring the guide tu e so close to the indicator as to obscure the laying out mark, there will always be a suiiicient space for the operator to observe the laying out marks in order to bring the indicator on the jig in proper alinement with the laying out mark on the work. By this means the tool will be very quickly and easily centered in position with respect to the work required and no further adjustment of the parts nor further marks or measurements will be neccssary after the jig is set. lt is well known that in boring dowels in order to insure accuracy of the work, it is necessary for the workman to lay out and indicate by marks the points he desires to bore, after which the is placed upon the work, the indicator 29 on the jig corresponding or coinciding with the iirst laying out point, after which the screw 3 is operated to lock the )arts and the bit is then ready to bore. By loosening the screw 3, the jig can be quickly moved to the next laying out point, accurately set by the indicator and again locked and the bit operated to bore, this being repeated as often as it is desired to bore. It will be further noted that the guide 16, by reason of the arrangement o'f the parts, is located extremely close to the work, by which arrangement the operating end ol' the body or tool is held or guided directly to the proper point regardless of the grain, which heretofore has proved av serious drawback to exact work, even where the work is done by machinery, since the tool being of a certain length, vibrates and does not strike the exact point, or if striking a grain, goes either' to one side or the other of the proper oint, thus accuracy of the work is impossib e.

Attention is called to the fact that by reason of the engagement of the hook 17 with the expansible guide 16, when said hook is tightened by thumb nut 26, it will press the guide between it and the V-seat 11 of the block so that the guide will be properly positioned and held, depending upon the size of the tool or bit 17x employed.

Having thus described my invention, Wh at l claim as new and desire to secure by Letters Patent, is z-- 1. ln a device of the character described, a frame, means for adjustably connecting the` same with the article to be bored, an eX ansible guide adjustably mounted on said rame, and means for locking said guide in position.

2. ln a device of the character described, a frame, means for adjustably connecting the same with the article to be bored, a block rnovably carried by said frame and having a il-seat, means for locking the block in its adjusted position, an eXpansible guide seated in said tl -seat and. means for locking the same therein.

ln a device of the character described, a frame, means for connecting the same with the article to be bored, a block movabl y carried by said frame and having a if-seat, means 'for locking the block in its adjusted position, an expansible guide seated in said V-seat and a. liook for looking seid guide in said seat. i

ln ii device of tlie character described, e frame, ineens for connecting,` tl'ie same Witli tlie article to be bored, :i block movebly cerried by said frame end having e, if-seat, ineens for locking tlie block in. its adjusted position, en expensible guide seetcd in seid il-seat end e liool baring a ii-slumped seat formed to lock seid guido in position.

ln ii device of tlie clierecter described, e treme, e screw movable tlierein, plete between Wliicli end seid screw the article to be bored is seated, tracks on seid traine, e block move-ble between seid tracks and having' e Vsliaped seat, ineens for locking seid block in its adjusted position, e liool; removably connected With seid fra-nie, 'n adjustable guide lield between said liook and seid iiseat, and e stop carried by the tool for limiting, the movement tl'iereol.

6. ln e device of the character described e freine, means for connecting tbe seme With tlie article to be bored., e blocl movably cer- ,1. in e device of tlie clierecter described e freine, ineens for connecting tbe same with tlie article to be bored., e block movebly cairried by seid Treme, ineens for .locking tlie blo-ck in its adjusted position, en eXpa-nsible guide sented in seid block, and e book for lockingv seid guide therein.

S. n e device ol tlie character described a treme, plurality of lugs thereon, demping ineens secured to one of seid lugs, e plurali@T of guides on seid. frame, e block movable therein, ineens for locking seid block in edjusted position, en expensible sleeve seated in seid block and ineens for locking the seme therein.

MORRIS F. RGBERTS.

Tvvvitnesses C, D. MCVAY, E. C. Giifnn. 

